Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
nationalcb.com
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-18 17:04:15 UTC · ↺ Refresh
MX Hostnames
- nationalcb-com.mail.protection.outlook.com
MX Priorities
- nationalcb-com.mail.protection.outlook.com: 0
A / AAAA Records
- 50.28.9.181 ↩ node923.lookhosting.com
Mail Server IPs
- 52.101.194.4 ↩ mail-ch4pr04cu00104.inbound.protection.outlook.com
- 52.101.9.0 ↩ mail-bl2pr02cu00100.inbound.protection.outlook.com
- 52.101.8.46 ↩ mail-dm6pr05cu00406.inbound.protection.outlook.com
- 52.101.11.10 ↩ mail-sa9pr03cu00202.inbound.protection.outlook.com
- 2a01:111:f403:f805::1 ↩ mail-co1pr03cu00301.inbound.protection.outlook.com
- 2a01:111:f403:c92c::2 ↩ mail-dm2pr04cu00102.inbound.protection.outlook.com
- 2a01:111:f403:c946::4 ↩ mail-ch0pr04cu00504.inbound.protection.outlook.com
- 2a01:111:f403:f802::3 ↩ mail-sj0pr03cu01403.inbound.protection.outlook.com
SOA Record
Raw SOA
ns1.lookhosting.com vendors.lookmedia.com 2026031805 3600 7200 1209600 86400
Primary NS (mname)
ns1.lookhosting.com
Admin Email (rname)
vendors@lookmedia.com
Serial
2026031805
Refresh
3600s
Retry
7200s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns1.lookhosting.com
ns2.lookhosting.com
SPF Record
✓ Strict (-all)
v=spf1 ip4:50.28.9.181 include:spf.protection.outlook.com -all
📊 DNS lookups: 1/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ MissingNo DMARC record — emails cannot be rejected on auth failure.
DKIM Selectors
✓ 1 found
default._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: default
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
2 records- MS=ms85060829
- SPFv=spf1 ip4:50.28.9.181 include:spf.protection.outlook.com -all
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